How can I identify a UK spec headlight (naked) from an Euro spec bike?

[Taipan]

My bikes an import and the headlight lights up the right hand side and not the left hand side, so I'd like to put a UK spec headlight on it. How can I make sure I dont buy another euro spec headlight? Are there any markings or writing on the headlamp glass that identify it?

[phi-dan]

IIRC, UK lenses will be marked e11 (or E11), and take 2 x h4 60/55W bulbs
hth